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Table 1 General characteristics of pregnant and postpartum women according to whether admitted to ICU or not

From: Variability in intensive care unit admission among pregnant and postpartum women in Canada: a nationwide population-based observational study

  Pregnancies with ICU admission* (n = 10,204) Pregnancies without ICU admission* (n = 3,152,099) Standardized difference
Delivery admissions 9001 (88.2%) 3,020,112 (95.8%) − 0.28
Antepartum admissions 2596 (25.4%) 250,372 (7.9%) 0.48
Postpartum admissions 2583 (25.3%) 58,652 (1.9%) 0.73
Abortions or ectopic pregnancy-related admissions 918 (9.0%) 107,097 (3.4%) 0.23
Age (years) (mean ± SD) 30.5 ± 6.3 29.5 ± 5.6 0.16
 < 15 8 (0.08%) 1191 (0.04%) 0.22
 15–19 475 (4.7%) 136,868 (4.3%)  
 20–24 1365 (13.5%) 480,141 (15.3%)  
 25–29 2491 (24.6%) 913,371 (29.0%)  
 30–34 3042 (30.0%) 1,006,926 (32.0%)  
 35–39 2026 (20.0%) 500,255 (15.9%)  
 40–44 653 (6.4%) 102,423 (3.2%)  
 45+ 81 (0.8%) 5932 (0.2%)  
Gestational week at delivery admission (weeks) 36.0 ± 4.7 38.7 ± 2.5 − 0.72
Maternal comorbidity index 1.62 ± 2.06 0.47 ± 0.84 0.73
Live birth 9005 (88.2%) 3,020,305 (95.8%) − 0.28
Singleton birth 8535 (83.6%) 2,970,321 (94.2%) − 0.34
Twin birth 484 (4.7%) 51,029 (1.6%) 0.18
> Triplet birth 17 (0.2%) 1780 (0.06%) 0.03
Parity 0.17
 0 6598 (64.7%) 1,829,634 (58.0%)  
 1 1939 (19.0%) 818,031 (26.0%)
 2+ 1667 (16.3%) 504,434 (16.0%)
Residence rurality (0.7% missing) - 0.01
 Urban 8225 (81.2%) 2,559,659 (81.8%)  
 Rural 1907 (18.8%) 568,117 (18.2%)
Residence income quintile (14.0% missing) 0.11
 Quintile 1 (lowest) 2603 (29.3%) 684,917 (25.3%)  
 Quintile 2 1929 (21.7%) 571,796 (21.1%)
 Quintile 3 1659 (18.7%) 523,475 (19.3%)
 Quintile 4 1485 (16.7%) 493,408 (18.2%)
 Quintile 5 (highest) 1212 (13.6%) 435,658 (16.1%)
Hospital rurality (0.6% missing) − 0.01
 Urban 9917 (97.8%) 3,066,345 (97.9%)  
 Rural 224 (2.2%) 66,429 (2.1%)
Delivery mode
 Vaginal 2148 (21.0%) 2,157,286 (68.4%) − 1.08
 Cesarean section 4425 (43.4%) 817,172 (25.9%)  
Transfer to another institution for acute care 1594 (15.6%) 38,350 (1.2%) 0.54
Readmission 1381 (13.5%) 42,338 (1.3%) 0.48
Province or territory of admission
 Newfoundland and Labrador 260 (2.5%) 51,481 (1.6%) 0.25
 Prince Edward Island 39 (0.4%) 15,410 (0.5%)  
 Nova Scotia 226 (2.2%) 95,713 (3.0%)
 New Brunswick 298 (2.9%) 80,163 (2.5%)
 Ontario 5967 (58.5%) 1,524,080 (48.3%)
 Manitoba 376 (3.7%) 181,367 (5.7%)
 Saskatchewan 494 (4.8%) 158,537 (5.0%)
 Alberta 1177 (11.5%) 553,741 (17.6%)
 British Columbia 1308 (12.8%) 473,437 (15.0%)
 Territories 59 (0.6%) 18,170 (0.6%)
Severe maternal morbidity (any versus none) 5017 (49.2%) 44,995 (1.4%) 1.31
 0 (number of severe maternal morbidity events) 4588 (45.0%) 3,106,352 (98.5%) 1.48
 1 2616 (25.6%) 41,884 (1.3%)  
 2 1351 (13.2%) 2890 (0.09%)
 3 719 (7.0%) 625 (0.02%)
 ≥ 4 930 (9.1%) 348 (0.01%)
Length of hospital stay (days) 11.1 ± 16.4 2.7 ± 3.3 0.71
Hospital mortality during episode of pregnancy care 130 (1.3%) 65 (0.00%) 0.16
Hospital group according to hospital volume of pregnancy
 1 (lowest volume) 204 (2.0%) 19,476 (0.6%) 0.15
 2 203 (2.0%) 66,852 (2.1%)
 3 818 (8.0%) 211,392 (6.7%)
 4 2165 (21.2%) 598,849 (19.0%)  
 5 (highest) 6814 (66.8%) 2,255,530 (71.6%)
  1. *Data are presented as mean ± SD, median [interquartiles] or %
  2. Standardized difference = difference in means or proportions divided by standard error. Standardized mean differences of 0.2, 0.5, and 0.8 are often/generally equated to effect sizes of small, medium, and large, respectively